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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Ion Exchange01:17

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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High-Entropy Electrolyte Driven by Multi-Solvation Structures for Long-Lifespan Aqueous Zinc Metal Pouch Cells.

Ziqing Wang1, Jiefeng Diao1,2, Rinish R Vaidyula1

  • 1Department of Chemistry, The University of Texas at Austin, 78712, Austin, TX, United States.

Angewandte Chemie (International Ed. in English)
|November 6, 2024
PubMed
Summary

A novel high-entropy electrolyte (HEE) using ternary salts enhances aqueous zinc batteries, improving stability and performance across wide temperatures. This offers a promising solution for grid-scale energy storage.

Keywords:
high-entropy electrolytelow temperaturepouch cellsolvation structurezinc metal batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous zinc metal batteries (AZMBs) offer cost-effective and safe grid-scale energy storage.
  • Key limitations include poor electrolyte stability and low freezing points, hindering practical application.
  • Existing electrolytes struggle to balance performance across diverse temperature conditions.

Purpose of the Study:

  • To develop a novel high-entropy electrolyte (HEE) for AZMBs.
  • To overcome the limitations of poor stability and unfavorable freezing points in aqueous electrolytes.
  • To enhance the electrochemical performance and operational temperature range of AZMBs.

Main Methods:

  • A ternary salts-based high-entropy electrolyte (HEE) composed of Zn0.2Na0.4Li0.4(ClO4)1.2·7H2O was synthesized.
  • Advanced characterization techniques and theoretical calculations were employed to analyze electrolyte properties.
  • Electrochemical performance was evaluated using Zn/Zn symmetric cells and full cells (Na0.33V2O5/Zn and polyaniline/Zn).

Main Results:

  • The HEE exhibited reduced ion cluster size, increased solvation species, and promoted anion-rich Zn2+ solvation structures.
  • This resulted in an enlarged electrochemical stability window, favorable viscosity, improved ionic conductivity, and a low freezing point.
  • Zn/Zn symmetric cells demonstrated stable cycling for over 1000 hours (room temp) and 1500 hours (subzero temp); full cells achieved >20,000 cycles at -20°C.

Conclusions:

  • The HEE strategy effectively increases electrolyte entropy through diverse solvation structures, enhancing electrochemical stability and low-temperature performance.
  • This approach provides a facile route to high-performance, long-lifespan AZMBs suitable for wide-temperature applications.
  • The developed HEE shows significant potential for advancing grid-scale energy storage solutions.